This should be part of any modern client.
https://ircv3.net/irc/#sasl-authentication
https://ircv3.net/specs/extensions/sasl-3.1
https://ircv3.net/specs/extensions/sasl-3.2
Should be fairly easy to implement.
Tomatix
added this to the Version 1.1.0 milestone 3 years ago
This should be part of any modern client.
https://ircv3.net/irc/#sasl-authentication
https://ircv3.net/specs/extensions/sasl-3.1
https://ircv3.net/specs/extensions/sasl-3.2
Should be fairly easy to implement.